VTech i6775 - Manual (Page 9)

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Installation
If you subscribe to DSL service
If you hear interference during conversations and/or your caller ID features are not functioning properly,
install a noise filter to the telephone line between the base unit and the telephone line jack. Contact
your DSL provider to obtain a noise filter.
Telephone line
cord
Noise filter (For
DSL users)
To single telephone
jack (RJ11C)
Belt clip (optional)
To remove To attach